Advancing price-performance for developers with GPT‑5.6 in Kiro

GPT-5.6 Sol, Terra and Luna are now selectable inside Kiro, with OpenAI and AWS reporting Terra completing Terminal-Bench 2.1 tasks at roughly 82% lower cost than before.

• spec-driven development — Writing and agreeing the specification first, then having an agent implement against it — the spec, not the code, becomes the artifact you maintain.
• AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.

• postGPT-5.6 arrives in Kiro with a cost-per-task claimOpenAI Developers
• articleGPT-5.6 goes GA with an "ultra" parallel-agent setting and sharp cost claimsSam Altman
• articleAdvancing the price-performance frontier with GPT-5.6Simon Willison

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